[llvm] r192294 - [Sparc] Disable tail call optimization for sparc64.

[Venkatraman Govindaraju]

Author: venkatra
Date: Wed Oct  9 07:50:39 2013
New Revision: 192294

URL: http://llvm.org/viewvc/llvm-project?rev=192294&view=rev
Log:
[Sparc] Disable tail call optimization for sparc64.

This patch fixes PR17506.


Modified:
    llvm/trunk/lib/Target/Sparc/SparcISelLowering.cpp
    llvm/trunk/test/CodeGen/SPARC/2011-01-11-Call.ll

Modified: llvm/trunk/lib/Target/Sparc/SparcISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Sparc/SparcISelLowering.cpp?rev=192294&r1=192293&r2=192294&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Sparc/SparcISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/Sparc/SparcISelLowering.cpp Wed Oct  9 07:50:39 2013
@@ -1035,6 +1035,9 @@ SparcTargetLowering::LowerCall_64(Target
   SDLoc DL = CLI.DL;
   SDValue Chain = CLI.Chain;
 
+  // Sparc target does not yet support tail call optimization.
+  CLI.IsTailCall = false;
+
   // Analyze operands of the call, assigning locations to each operand.
   SmallVector<CCValAssign, 16> ArgLocs;
   CCState CCInfo(CLI.CallConv, CLI.IsVarArg, DAG.getMachineFunction(),

Modified: llvm/trunk/test/CodeGen/SPARC/2011-01-11-Call.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/SPARC/2011-01-11-Call.ll?rev=192294&r1=192293&r2=192294&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/SPARC/2011-01-11-Call.ll (original)
+++ llvm/trunk/test/CodeGen/SPARC/2011-01-11-Call.ll Wed Oct  9 07:50:39 2013
@@ -1,4 +1,24 @@
 ; RUN: llc -march=sparc -O0 <%s
+; RUN: llc -march=sparc   <%s | FileCheck %s --check-prefix=V8
+; RUN: llc -march=sparcv9 <%s | FileCheck %s --check-prefix=V9
+
+; V8-LABEL: test
+; V8:       save %sp
+; V8:       call foo
+; V8-NEXT:  nop
+; V8:       call bar
+; V8-NEXT:  nop
+; V8:       jmp %i7+8
+; V8-NEXT:  restore
+
+; V9-LABEL: test
+; V9:       save %sp
+; V9:       call foo
+; V9-NEXT:  nop
+; V9:       call bar
+; V9-NEXT:  nop
+; V9:       jmp %i7+8
+; V9-NEXT:  restore
 
 define void @test() nounwind {
 entry:
@@ -11,3 +31,23 @@ declare i32 @foo(...)
 
 declare void @bar(...)
 
+
+; V8-LABEL: test_tail_call_with_return
+; V8:       save %sp
+; V8:       call foo
+; V8-NEXT:  nop
+; V8:       jmp %i7+8
+; V8-NEXT:  restore %g0, %o0, %o0
+
+; V9-LABEL: test_tail_call_with_return
+; V9:       save %sp
+; V9:       call foo
+; V9-NEXT:  nop
+; V9:       jmp %i7+8
+; V9-NEXT:  restore %g0, %o0, %o0
+
+define i32 @test_tail_call_with_return() nounwind {
+entry:
+ %0 = tail call i32 (...)* @foo() nounwind
+ ret i32 %0
+}